<div class="am-modal am-modal-alert modal-outstanding" tabindex="-1" id="my-alert">
  <div class="am-modal-dialog">
     <div class="am-modal-bd">请选择出行日期</div>
     <div class="am-modal-footer">
       <span class="am-modal-btn">确定</span>
     </div>
  </div>
</div>

<div class="am-modal am-modal-alert modal-outstanding" tabindex="-1" id="alert">
  <div class="am-modal-dialog">
     <div class="am-modal-bd error-message"></div>
     <div class="am-modal-footer">
       <span class="am-modal-btn">确定</span>
     </div>
  </div>
</div>